<?php

// +----------------------------------------------------------------------+
// | PHP version 4.1.0                                                    |
// +----------------------------------------------------------------------+
// | Placed in public domain by Allan Hansen, 2002. Share and enjoy!      |
// +----------------------------------------------------------------------+
// | /demo/demo.audioinfo.class.php                                       |
// |                                                                      |
// | Example wrapper class to extract information from audio files        |
// | through getID3().                                                    |
// |                                                                      |
// | getID3() returns a lot of information. Much of this information is   |
// | not needed for the end-application. It is also possible that some    |
// | users want to extract specific info. Modifying getID3() files is a   |
// | bad idea, as modifications needs to be done to future versions of    |
// | getID3().                                                            |
// |                                                                      |
// | Modify this wrapper class instead. This example extracts certain     |
// | fields only and adds a new root value - encoder_options if possible. |
// | It also checks for mp3 files with wave headers.                      |
// +----------------------------------------------------------------------+
// | Example code:                                                        |
// |   $au = new AudioInfo();                                             |
// |   print_r($au->Info('file.flac');                                    |
// +----------------------------------------------------------------------+
// | Authors: Allan Hansen <ah�artemis*dk>                                |
// +----------------------------------------------------------------------+
//

/**
 * getID3() settings
 */
require_once '../getid3/getid3.php';

/**
 * Class for extracting information from audio files with getID3().
 */
class AudioInfo
{
    /**
     * Private variables
     */
    public $result = null;
    public $info = null;

    /**
     * Constructor
     */
    public function __construct()
    {
        // Initialize getID3 engine
        $this->getID3 = new getID3();
        $this->getID3->option_md5_data = true;
        $this->getID3->option_md5_data_source = true;
        $this->getID3->encoding = 'UTF-8';
    }

    /**
     * Extract information - only public function
     *
     * @param    string  file    Audio file to extract info from.
     */
    public function Info($file)
    {
        // Analyze file
        $this->info = $this->getID3->analyze($file);

        // Exit here on error
        if (isset($this->info['error'])) {
            return array('error' => $this->info['error']);
        }

        // Init wrapper object
        $this->result = array();
        $this->result['format_name'] = (isset($this->info['fileformat']) ? $this->info['fileformat'] : '').'/'.(isset($this->info['audio']['dataformat']) ? $this->info['audio']['dataformat'] : '').(isset($this->info['video']['dataformat']) ? '/'.$this->info['video']['dataformat'] : '');
        $this->result['encoder_version'] = (isset($this->info['audio']['encoder'])         ? $this->info['audio']['encoder']         : '');
        $this->result['encoder_options'] = (isset($this->info['audio']['encoder_options']) ? $this->info['audio']['encoder_options'] : '');
        $this->result['bitrate_mode'] = (isset($this->info['audio']['bitrate_mode'])    ? $this->info['audio']['bitrate_mode']    : '');
        $this->result['channels'] = (isset($this->info['audio']['channels'])        ? $this->info['audio']['channels']        : '');
        $this->result['sample_rate'] = (isset($this->info['audio']['sample_rate'])     ? $this->info['audio']['sample_rate']     : '');
        $this->result['bits_per_sample'] = (isset($this->info['audio']['bits_per_sample']) ? $this->info['audio']['bits_per_sample'] : '');
        $this->result['playing_time'] = (isset($this->info['playtime_seconds'])         ? $this->info['playtime_seconds']         : '');
        $this->result['avg_bit_rate'] = (isset($this->info['audio']['bitrate'])         ? $this->info['audio']['bitrate']         : '');
        $this->result['tags'] = (isset($this->info['tags'])                     ? $this->info['tags']                     : '');
        $this->result['comments'] = (isset($this->info['comments'])                 ? $this->info['comments']                 : '');
        $this->result['warning'] = (isset($this->info['warning'])                  ? $this->info['warning']                  : '');
        $this->result['md5'] = (isset($this->info['md5_data'])                 ? $this->info['md5_data']                 : '');

        // Post getID3() data handling based on file format
        $method = (isset($this->info['fileformat']) ? $this->info['fileformat'] : '').'Info';
        if ($method && method_exists($this, $method)) {
            $this->$method();
        }

        return $this->result;
    }

    /**
     * post-getID3() data handling for AAC files.
     */
    public function aacInfo()
    {
        $this->result['format_name'] = 'AAC';
    }

    /**
     * post-getID3() data handling for Wave files.
     */
    public function riffInfo()
    {
        if ($this->info['audio']['dataformat'] == 'wav') {
            $this->result['format_name'] = 'Wave';
        } elseif (preg_match('#^mp[1-3]$#', $this->info['audio']['dataformat'])) {
            $this->result['format_name'] = strtoupper($this->info['audio']['dataformat']);
        } else {
            $this->result['format_name'] = 'riff/'.$this->info['audio']['dataformat'];
        }
    }

    /**
     * * post-getID3() data handling for FLAC files.
     */
    public function flacInfo()
    {
        $this->result['format_name'] = 'FLAC';
    }

    /**
     * post-getID3() data handling for Monkey's Audio files.
     */
    public function macInfo()
    {
        $this->result['format_name'] = 'Monkey\'s Audio';
    }

    /**
     * post-getID3() data handling for Lossless Audio files.
     */
    public function laInfo()
    {
        $this->result['format_name'] = 'La';
    }

    /**
     * post-getID3() data handling for Ogg Vorbis files.
     */
    public function oggInfo()
    {
        if ($this->info['audio']['dataformat'] == 'vorbis') {
            $this->result['format_name'] = 'Ogg Vorbis';
        } elseif ($this->info['audio']['dataformat'] == 'flac') {
            $this->result['format_name'] = 'Ogg FLAC';
        } elseif ($this->info['audio']['dataformat'] == 'speex') {
            $this->result['format_name'] = 'Ogg Speex';
        } else {
            $this->result['format_name'] = 'Ogg '.$this->info['audio']['dataformat'];
        }
    }

    /**
     * post-getID3() data handling for Musepack files.
     */
    public function mpcInfo()
    {
        $this->result['format_name'] = 'Musepack';
    }

    /**
     * post-getID3() data handling for MPEG files.
     */
    public function mp3Info()
    {
        $this->result['format_name'] = 'MP3';
    }

    /**
     * post-getID3() data handling for MPEG files.
     */
    public function mp2Info()
    {
        $this->result['format_name'] = 'MP2';
    }

    /**
     * post-getID3() data handling for MPEG files.
     */
    public function mp1Info()
    {
        $this->result['format_name'] = 'MP1';
    }

    /**
     * post-getID3() data handling for WMA files.
     */
    public function asfInfo()
    {
        $this->result['format_name'] = strtoupper($this->info['audio']['dataformat']);
    }

    /**
     * post-getID3() data handling for Real files.
     */
    public function realInfo()
    {
        $this->result['format_name'] = 'Real';
    }

    /**
     * post-getID3() data handling for VQF files.
     */
    public function vqfInfo()
    {
        $this->result['format_name'] = 'VQF';
    }
}
